2. After you add funds through Steam, you log onto redbana.com and go to www.redbana.com/home/home.aspx?steam=1 to checkout with Steam. It'll redirect you back to the Steam site to finalize the purchase.

I think you're logged in on the game under the Steam Client, the "Charge Cash" button in Fashion Mall should redirect you to the same link to checkout with Steam.

Hmmm, I checked both sites they’re up and running fine. If you tried to visit the redbana site during a maintenance , then the site would be unavailable until it’s over. If you get any other error while visiting either site, just submit a ticket to Steam or Redbana!